After Eärendur the realm of Arnor was split between his three sons, founding the realms of Arthedain, Cardolan and Rhudaur: the elder line of Kings continued with the Kings of Arthedain.

In Third Age 1349 the descedants of Eärendur had died out in Cardolan and Rhudaur, and Argeleb I of Arthedain again claimed the title King of Arnor. The Kings of Arthedain were then added to the elder list of Kings. Argeleb, 7th King of Arthedain, is thus referred to as the 17th of the Kings of Arnor, and Arvedui was the 25th and last King of the Northern Line. The list of Kings of Arthedain follows here: